use direct stream for resume

src/hooks/use-jellyfin.ts

@@ -622,6 +622,15 @@ export function useSimilarItems(itemId?: string, limit = 12) {
  * has to load first so the first PlaybackInfo request includes the
  * saved StartTimeTicks - otherwise the video streams from 0 and
  * reloads mid-playback when the second query returns.
+ *
+ * `requireDirectStream` is used for resume: the direct-play
+ * /Videos/{id}/stream endpoint with `static=true` returns the file
+ * from byte 0 even when StartTimeTicks is passed, because Chromium
+ * / WebView2 don't send a Range header for the initial GET. The
+ * direct-stream path has the server read the file from the start
+ * position itself and stream the bytes, so the response naturally
+ * starts at the saved offset. Direct-stream is not transcoding -
+ * it's just server-side file I/O with no encoding work.
  */
 export function usePlaybackInfo(
   itemId?: string,
@@ -629,6 +638,7 @@ export function usePlaybackInfo(
   audioStreamIndex?: number,
   maxStreamingBitrate?: number,
   enabled: boolean = true,
+  requireDirectStream: boolean = false,
 ) {
   const api = useApi()
   const audioPassthrough = usePreferencesStore(s => s.audioPassthrough)
@@ -640,6 +650,7 @@ export function usePlaybackInfo(
       startTimeTicks,
       audioStreamIndex,
       maxStreamingBitrate,
+      requireDirectStream,
     ],
     queryFn: async () => {
       if (!api || !itemId) return null
@@ -657,7 +668,12 @@ export function usePlaybackInfo(
           AudioStreamIndex: audioStreamIndex,
           DeviceProfile: await browserDeviceProfile(audioPassthrough) as any,
           AutoOpenLiveStream: true,
-          EnableDirectPlay: true,
+          // For resume, prefer direct-stream so the server starts the
+          // read at StartTimeTicks. Direct-play can't honour start
+          // time on the initial GET. Otherwise let the server pick
+          // direct-play for the no-resume case so the browser plays
+          // the file as-is.
+          EnableDirectPlay: !requireDirectStream,
           EnableDirectStream: true,
           EnableTranscoding: true,
           AllowVideoStreamCopy: true,

src/pages/PlayerPage.tsx

@@ -331,6 +331,7 @@ export default function PlayerPage() {
     streamAudioIndex ?? undefined,
     maxBitrate,
     playbackInfoReady,
+    startTimeTicks !== undefined,
   )
   const resolvedSource = playbackInfo?.MediaSources?.[0]
   const streamUrl = (() => {